305 lines
10 KiB
C++
305 lines
10 KiB
C++
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <chrono>
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#include <cmath>
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#include "common/math_util.h"
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#include "common/settings.h"
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#include "input_common/helpers/stick_from_buttons.h"
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namespace InputCommon {
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class Stick final : public Common::Input::InputDevice {
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public:
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using Button = std::unique_ptr<Common::Input::InputDevice>;
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Stick(Button up_, Button down_, Button left_, Button right_, Button modifier_,
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float modifier_scale_, float modifier_angle_)
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: up(std::move(up_)), down(std::move(down_)), left(std::move(left_)),
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right(std::move(right_)), modifier(std::move(modifier_)), modifier_scale(modifier_scale_),
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modifier_angle(modifier_angle_) {
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Common::Input::InputCallback button_up_callback{
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[this](Common::Input::CallbackStatus callback_) { UpdateUpButtonStatus(callback_); }};
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Common::Input::InputCallback button_down_callback{
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[this](Common::Input::CallbackStatus callback_) { UpdateDownButtonStatus(callback_); }};
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Common::Input::InputCallback button_left_callback{
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[this](Common::Input::CallbackStatus callback_) { UpdateLeftButtonStatus(callback_); }};
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Common::Input::InputCallback button_right_callback{
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[this](Common::Input::CallbackStatus callback_) {
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UpdateRightButtonStatus(callback_);
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}};
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Common::Input::InputCallback button_modifier_callback{
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[this](Common::Input::CallbackStatus callback_) { UpdateModButtonStatus(callback_); }};
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up->SetCallback(button_up_callback);
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down->SetCallback(button_down_callback);
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left->SetCallback(button_left_callback);
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right->SetCallback(button_right_callback);
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modifier->SetCallback(button_modifier_callback);
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last_x_axis_value = 0.0f;
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last_y_axis_value = 0.0f;
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}
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bool IsAngleGreater(float old_angle, float new_angle) const {
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constexpr float TAU = Common::PI * 2.0f;
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// Use wider angle to ease the transition.
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constexpr float aperture = TAU * 0.15f;
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const float top_limit = new_angle + aperture;
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return (old_angle > new_angle && old_angle <= top_limit) ||
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(old_angle + TAU > new_angle && old_angle + TAU <= top_limit);
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}
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bool IsAngleSmaller(float old_angle, float new_angle) const {
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constexpr float TAU = Common::PI * 2.0f;
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// Use wider angle to ease the transition.
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constexpr float aperture = TAU * 0.15f;
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const float bottom_limit = new_angle - aperture;
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return (old_angle >= bottom_limit && old_angle < new_angle) ||
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(old_angle - TAU >= bottom_limit && old_angle - TAU < new_angle);
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}
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float GetAngle(std::chrono::time_point<std::chrono::steady_clock> now) const {
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constexpr float TAU = Common::PI * 2.0f;
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float new_angle = angle;
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auto time_difference = static_cast<float>(
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std::chrono::duration_cast<std::chrono::microseconds>(now - last_update).count());
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time_difference /= 1000.0f * 1000.0f;
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if (time_difference > 0.5f) {
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time_difference = 0.5f;
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}
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if (IsAngleGreater(new_angle, goal_angle)) {
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new_angle -= modifier_angle * time_difference;
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if (new_angle < 0) {
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new_angle += TAU;
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}
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if (!IsAngleGreater(new_angle, goal_angle)) {
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return goal_angle;
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}
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} else if (IsAngleSmaller(new_angle, goal_angle)) {
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new_angle += modifier_angle * time_difference;
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if (new_angle >= TAU) {
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new_angle -= TAU;
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}
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if (!IsAngleSmaller(new_angle, goal_angle)) {
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return goal_angle;
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}
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} else {
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return goal_angle;
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}
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return new_angle;
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}
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void SetGoalAngle(bool r, bool l, bool u, bool d) {
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// Move to the right
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if (r && !u && !d) {
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goal_angle = 0.0f;
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}
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// Move to the upper right
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if (r && u && !d) {
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goal_angle = Common::PI * 0.25f;
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}
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// Move up
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if (u && !l && !r) {
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goal_angle = Common::PI * 0.5f;
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}
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// Move to the upper left
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if (l && u && !d) {
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goal_angle = Common::PI * 0.75f;
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}
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// Move to the left
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if (l && !u && !d) {
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goal_angle = Common::PI;
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}
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// Move to the bottom left
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if (l && !u && d) {
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goal_angle = Common::PI * 1.25f;
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}
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// Move down
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if (d && !l && !r) {
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goal_angle = Common::PI * 1.5f;
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}
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// Move to the bottom right
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if (r && !u && d) {
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goal_angle = Common::PI * 1.75f;
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}
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}
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void UpdateUpButtonStatus(Common::Input::CallbackStatus button_callback) {
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up_status = button_callback.button_status.value;
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UpdateStatus();
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}
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void UpdateDownButtonStatus(Common::Input::CallbackStatus button_callback) {
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down_status = button_callback.button_status.value;
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UpdateStatus();
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}
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void UpdateLeftButtonStatus(Common::Input::CallbackStatus button_callback) {
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left_status = button_callback.button_status.value;
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UpdateStatus();
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}
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void UpdateRightButtonStatus(Common::Input::CallbackStatus button_callback) {
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right_status = button_callback.button_status.value;
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UpdateStatus();
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}
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void UpdateModButtonStatus(Common::Input::CallbackStatus button_callback) {
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modifier_status = button_callback.button_status.value;
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UpdateStatus();
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}
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void UpdateStatus() {
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const float coef = modifier_status ? modifier_scale : 1.0f;
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bool r = right_status;
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bool l = left_status;
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bool u = up_status;
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bool d = down_status;
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// Eliminate contradictory movements
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if (r && l) {
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r = false;
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l = false;
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}
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if (u && d) {
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u = false;
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d = false;
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}
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// Move if a key is pressed
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if (r || l || u || d) {
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amplitude = coef;
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} else {
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amplitude = 0;
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}
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const auto now = std::chrono::steady_clock::now();
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const auto time_difference = static_cast<u64>(
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std::chrono::duration_cast<std::chrono::milliseconds>(now - last_update).count());
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if (time_difference < 10) {
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// Disable analog mode if inputs are too fast
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SetGoalAngle(r, l, u, d);
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angle = goal_angle;
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} else {
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angle = GetAngle(now);
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SetGoalAngle(r, l, u, d);
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}
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last_update = now;
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Common::Input::CallbackStatus status{
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.type = Common::Input::InputType::Stick,
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.stick_status = GetStatus(),
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};
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last_x_axis_value = status.stick_status.x.raw_value;
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last_y_axis_value = status.stick_status.y.raw_value;
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TriggerOnChange(status);
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}
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void ForceUpdate() override {
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up->ForceUpdate();
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down->ForceUpdate();
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left->ForceUpdate();
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right->ForceUpdate();
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modifier->ForceUpdate();
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}
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void SoftUpdate() override {
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Common::Input::CallbackStatus status{
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.type = Common::Input::InputType::Stick,
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.stick_status = GetStatus(),
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};
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if (last_x_axis_value == status.stick_status.x.raw_value &&
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last_y_axis_value == status.stick_status.y.raw_value) {
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return;
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}
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last_x_axis_value = status.stick_status.x.raw_value;
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last_y_axis_value = status.stick_status.y.raw_value;
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TriggerOnChange(status);
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}
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Common::Input::StickStatus GetStatus() const {
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Common::Input::StickStatus status{};
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status.x.properties = properties;
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status.y.properties = properties;
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if (Settings::values.emulate_analog_keyboard) {
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const auto now = std::chrono::steady_clock::now();
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float angle_ = GetAngle(now);
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status.x.raw_value = std::cos(angle_) * amplitude;
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status.y.raw_value = std::sin(angle_) * amplitude;
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return status;
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}
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constexpr float SQRT_HALF = 0.707106781f;
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int x = 0, y = 0;
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if (right_status) {
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++x;
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}
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if (left_status) {
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--x;
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}
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if (up_status) {
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++y;
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}
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if (down_status) {
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--y;
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}
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const float coef = modifier_status ? modifier_scale : 1.0f;
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status.x.raw_value = static_cast<float>(x) * coef * (y == 0 ? 1.0f : SQRT_HALF);
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status.y.raw_value = static_cast<float>(y) * coef * (x == 0 ? 1.0f : SQRT_HALF);
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return status;
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}
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private:
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Button up;
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Button down;
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Button left;
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Button right;
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Button modifier;
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float modifier_scale;
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float modifier_angle;
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float angle{};
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float goal_angle{};
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float amplitude{};
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bool up_status;
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bool down_status;
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bool left_status;
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bool right_status;
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bool modifier_status;
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float last_x_axis_value;
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float last_y_axis_value;
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const Common::Input::AnalogProperties properties{0.0f, 1.0f, 0.5f, 0.0f, false};
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std::chrono::time_point<std::chrono::steady_clock> last_update;
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};
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std::unique_ptr<Common::Input::InputDevice> StickFromButton::Create(
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const Common::ParamPackage& params) {
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const std::string null_engine = Common::ParamPackage{{"engine", "null"}}.Serialize();
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auto up = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
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params.Get("up", null_engine));
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auto down = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
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params.Get("down", null_engine));
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auto left = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
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params.Get("left", null_engine));
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auto right = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
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params.Get("right", null_engine));
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auto modifier = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
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params.Get("modifier", null_engine));
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auto modifier_scale = params.Get("modifier_scale", 0.5f);
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auto modifier_angle = params.Get("modifier_angle", 5.5f);
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return std::make_unique<Stick>(std::move(up), std::move(down), std::move(left),
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std::move(right), std::move(modifier), modifier_scale,
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modifier_angle);
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}
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} // namespace InputCommon
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